142AH Preamplifier

Optimum performance for charged-particle or heavy-ion detectors requiring high bias voltage with capacitances of up to 100 pF

Extremely low noise

Accepts 0 to ±5 kV bias

Separate fast-timing output signal with rise time from <5 ns

The ORTEC Model 142AH Preamplifier was designed to meet the needs of experimenters who require optimum performance from their charged-particle or heavy-ion detectors. This requirement is satisfied by the charge-sensitive Model 142AH through its extremely low noise and fast-timing characteristics. It is particularly suitable for high-energy charged-particle spectroscopy where high-resolution detectors with capacitances of up to 100 pF and bias voltages of up to 5000 V are involved.

Literature
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More Info
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Model 142AH has a separate fast-timing output signal approximately 50 ns wide with rise times ranging from <5 ns for 0 pF detectors to <12 ns for 100 pF detectors. This feature enables it to be directly coupled to a timing discriminator for some applications.

When the Model 142AH is used in conjunction with ORTEC's standard electronics, excellent timing resolution is obtained.

Specifications
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PerformancePerformance specifications are for the ENERGY output unless stated otherwise.

Noise

Typical and Warranted Noise Values

Detector Capacitance (pF)

Noise (keV) (Si)

Typical

Warranted

0

20

50

100

1.55

1.65

2.35

3.35

1.75

-

-

3.60

Integral Nonlinearity

<±0.05% for 0 to ±7 V open circuit, or ±3.5 V terminated in 93 Ω.

Temperature Instability

<±50 ppm/°C from 0 to 50°C.

Open Loop Gain

>40,000.

Charge Sensitivity (Si equivalent)

Nominally 20 mV/MeV.

Rise Time

<5 ns at 0 pF; <12 ns at 100 pF; with a 0 to +0.5-V pulse at the ENERGY output and a 93-Ω load.

Negative or positive linear fast-clipped pulse for timing. Output generated by using an inverting transformer which differentiates the energy output. Rise time approximately equal to the rise time of the energy output. BNC connector.